一种基于OOK调制的电容型数字隔离器  

Implementation of a capacitive digital isolator based on OOK modulation

作　　者：廖坤 杨君中[2] 鞠玲 杨森 肖知明 LIAO Kun;YANG Junzhong;JU Ling;YANG Sen;XIAO Zhiming(College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300071,China;State Grid Taizhou Power Supply Company,Taizhou 225300,China)

机构地区：[1]南开大学电子信息与光学工程学院,天津300071 [2]国网泰州供电公司,江苏泰州225300

出　　处：《微电子学与计算机》2022年第9期125-132,共8页Microelectronics & Computer

基　　金：国家电网有限公司总部科技项目(5700-202155257A-0-0-00)。

摘　　要：针对高速电容型数字隔离器在"低速"应用下的高电流消耗问题,基于TSMC 180nm BCD工艺设计了一种基于OOK调制的低静态功耗全差分数字隔离器结构.通过发送机的逻辑控制电路产生的三组开关信号及振荡器模块产生的载波信号,提出的结构实现了对输入信号的调制.在传输信号频率变化时,基于跨导线性环结构的中点电位偏置电路将差分信号的直流电压均稳定在VDD/2附近,从而有效避免接收端直流电平衰减造成的误码.经由前置放大器放大后,接收端信号通过双阈值比较器完成解调.PVT仿真表明,在输入电源电压3~5.5V范围内,均可实现最高10Mbps传输速率,典型传输延时为13ns;典型情况下静态功耗仅为1.3mA,在1Mbps及10Mbps速率下的典型动态功耗分别为4mA及4.8mA.此设计支持多通道扩展,可通过共享内部振荡器及偏置模块进一步减小单通道平均功耗;此外隔离器在最高10Mbps输入PRBS(Pseudo-Random Binary Sequence)码下仍可准确解码,证明了此结构具有较强的传输鲁棒性.To solve the problems of high current consumption of high speed capacitive digital isolators in"low speed"application,a low static power consumption fully differential digital isolator based on OOK modulation is designed based on TSMC 180 nm BCD process.The proposed structure realizes the modulation of the input signal through three sets of switching signals generated in the logic control circuit of the transmitter and carrier signals generated by the oscillator module.When the transmission signal frequency changes,the midpoint potential bias circuit based on the cross-conductor ring structure can stabilize the DC voltage of the differential signal near VDD/2,so as to effectively avoid the error code caused by dc level attenuation at the receiving end.After amplification by a preamplifier,the receiver signal is demodulated by a dual threshold comparator.PVT simulation shows that the maximum transmission rate of 10 Mbps can be achieved in the range of 3~5.5 V input voltage,and the typical transmission delay is 13 ns.The typical transmission delay is 13 ns.The typical static power consumption is only 1.3 mA,and the typical dynamic power consumption is 4 mA and 4.8 mA at 1 Mbps and 10 Mbps respectively.This design supports multi-channel expansion,which can further reduce the average power consumption of single channel by sharing the internal oscillator and bias module.In addition,the isolator can decode correctly even at the highest 10 Mbps input PRBS(Pseudo-random Binary Sequence)code,which proves that this structure has strong transmission robustness.

关 键 词：电容耦合 开关键控调制 数字隔离器 跨导线性环 隔离通信 

分 类 号：TN433[电子电信—微电子学与固体电子学]